﻿/*******************************************************************************************
 * Copyright (c) 2006-2009 Alex Robson, Rob Simmons, Craig Israel, and Rachel Twyford
 *
 * Use of this software in any form requires that you have both 
 * read and agreed to the following terms:
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation 
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions: 
 *
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, 
 * this list of conditions and the following disclaimer in the 
 * documentation and/or other materials provided with the distribution.
 * Neither the name of Nvigorate nor the names of its contributors may 
 * be used to endorse or promote products derived from this software without 
 * specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL ANY CONTRIBUTOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ****************************************************************************************/

using System;
using System.Collections.Generic;
using Nvigorate.Common.Reflection;
using Nvigorate.Relational.Mapping.Interface;

namespace Nvigorate.Relational.Record
{
    public class InstanceRecord : IRecord
    {
        private int _fieldCount;
        private List<string> _fieldNames = new List<string>();
        private object _instance;

        #region IRecord Members

        /// <summary>
        /// Number of fields in this record 
        /// </summary>
        public int FieldCount
        {
            get { return _fieldCount; }
        }

        /// <summary>
        /// Returns the value for the field
        /// </summary>
        /// <param name="fieldName">Name of the desired field value</param>
        /// <returns>Object</returns>
        public object this[string fieldName]
        {
            get { return Reflector.Read(_instance, fieldName); }
            set { Reflector.Write(_instance, fieldName, value);}
        }

        /// <summary>
        /// Returns the value for the field
        /// </summary>
        /// <param name="fieldIndex">Name of the desired field value</param>
        /// <returns>Object</returns>
        public object this[int fieldIndex]
        {
            get { return Reflector.Read(_instance, _fieldNames[fieldIndex]); }
            set { Reflector.Write(_instance, _fieldNames[fieldIndex], value); }
        }

        /// <summary>
        /// Returns the value for the field
        /// </summary>
        /// <param name="point">The assignment point which describes how to get the value from the record</param>
        /// <returns>object</returns>
        public object this[IAssignmentPoint point]
        {
            get { return Reflector.Read(_instance, point.Field); }
            set { Reflector.Write(_instance, point.Field, value); }
        }

        /// <summary>
        /// List of field names in this record
        /// </summary>
        public List<string> FieldNames
        {
            get { return _fieldNames; }
        }

        /// <summary>
        /// The instance represented and contained by this IRecord container
        /// </summary>
        public object Instance
        {
            get { return _instance; }
            set { _instance = value; }
        }

        /// <summary>
        /// The name of the source for this record
        /// </summary>
        public string RecordSource
        {
            get { return _instance.GetType().FullName; }
        }

        /// <summary>
        /// Array of field values in this record
        /// </summary>
        public object[] FieldValues
        {
            get
            {
                object[] values = new object[_fieldCount];
                int index = 0;
                foreach (string fieldName in _fieldNames)
                {
                    values[index] = Reflector.Read(_instance, fieldName);
                    index++;
                }
                return values;
            }
        }

        /// <summary>
        /// Returns the list of sources which contributed data.
        /// This is crucial to the update code.
        /// </summary>
        /// <param name="map"></param>
        /// <returns></returns>
        public List<string> GetContributingSources(IBindingMap map)
        {
            return new List<string>()
                       {
                           this.GetType().Name
                       };
        }

        /// <summary>
        /// Returns the type of the given field name
        /// </summary>
        /// <param name="fieldName">Field name</param>
        /// <returns>Type</returns>
        public Type GetFieldType(string fieldName)
        {
            return Reflector.GetMemberType(_instance.GetType(), fieldName);
        }

        /// <summary>
        /// Returns the type of the field at the given index
        /// </summary>
        /// <param name="fieldIndex"></param>
        /// <returns></returns>
        public Type GetFieldType(int fieldIndex)
        {
            return Reflector.GetMemberType(_instance.GetType(), _fieldNames[fieldIndex]);
        }


        /// <summary>
        /// 
        /// </summary>
        /// <param name="point"></param>
        /// <returns></returns>
        public object GetValueForAssignment(IAssignmentPoint point)
        {
            return this[point];
        }

        /// <summary>
        /// Returns all related records by relationship name
        /// </summary>
        /// <returns></returns>
        public List<IRecord> GetRelatedRecords(string relationship)
        {
            return new List<IRecord>();
        }

        /// <summary>
        /// !NOT IMPLEMENTED!
        /// Returns an empty record which represents the schema
        /// of the related record
        /// </summary>
        /// <param name="relationship"></param>
        /// <returns></returns>
        public IRecord GetRelatedSchemaRecord(string relationship)
        {
            return null;
        }

        #region Implementation of IRecord

        public bool HasFieldForAssignment(IAssignmentPoint point)
        {
            return _fieldNames.Contains(point.Field);
        }

        #endregion

        #endregion

        public InstanceRecord()
        {
            
        }

        public InstanceRecord(object instance)
        {
            _instance = instance;
            foreach (string property in Reflector.GetProperties(instance.GetType()))
            {
                _fieldNames.Add(property);
            }
        }

        #region Implementation of IDisposable

        /// <summary>
        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
        /// </summary>
        /// <filterpriority>2</filterpriority>
        public void Dispose()
        {
            if(_fieldNames != null)
            {
                _fieldNames.Clear();
                _fieldNames = null;
            }
            _instance = null;
        }

        #endregion
    }
}